Investigations on the Relationship Between Porosity and Strength of Admixtures Modified High Performance Self-Compacting Concrete

Abstract

The influence of a type of new generation: superplasticizer (SP), anti-foaming admixture (AFA) and viscosity modifying admixture (VMA) on the air-content, workability of high performance self-compacting concrete (HPSCC) is analyzed in the paper. The purpose of this study was to examine the influence of type of the admixtures on porosity of HPSCC in the aspect of the compressive strength. The research results indicated that type of admixtures and its combinations result in different strengths of HPSCC, regardless of the total porosity characteristics of HPSCC.

Assessment of High Performance Self-Consolidating Concrete through an Experimental and Analytical Multi-Parameter Approach

“…Research showed that non-air-entrained HPC with w/b 0.22–0.31 could be extremely resistant to freeze-thaw damage and it was suggested that air-entrainment and supplementary cementitious materials are not needed. Among six mixtures tested; only the silica fume concrete with w/b 0.22 was frost resistant [ 8 ]. The weight change is an indication of the deterioration of the concrete specimen.…”

“…All specimens performed exceptionally well in salt scaling, confirming the durability of HPC. Also in [ 8 ] the weight loss of 0.1–4.5 kg/m 2 is obtained after 40 cycles of scaling, for 3 concrete types with an air content of 2, 4, and 6% and w/c ratio of 0.25–0.50.…”

“…To ensure stable and robust fresh stage properties, typically, a significant amount of fine materials has been incorporated into the mixture. In relative to traditional concrete, different durability characteristics can be expected for SCC because it can be produced with various mix compositions and the absence of vibration [ 8 , 9 , 10 ]. Due to the relatively short history of SCC in practical applications, there is a significant lack of information about long term performance in real structures.…”

“…The rheological properties of SCC such as yield stress and plastic viscosity [ 30 , 31 ] have also been investigated. Some researchers focused on the mix design and mix proportions [ 1 , 8 , 11 ]. The influence of mineral admixtures (i.e., silica fume, fly ash, metakaolin, ground granulated blast furnace slag, ladle slag) [ 32 , 33 , 34 , 35 ] and chemical admixtures (i.e., superplasticizers and viscosity modifying admixtures) [ 3 , 9 , 12 ] have also been studied on the performance of SCC.…”

Influences of Air-Voids on the Performance of 3D Printing Cementitious Materials

“…Air-void content has an adverse influence on the strength and durability of hardened cementitious materials [ 28 , 29 ]. For instance, the compressive strength of high-strength concrete reduces about 5% for each 1% increase in air content [ 30 ]. In addition, air-void size distribution strongly affects the performance of cementitious materials [ 31 , 32 , 33 , 34 , 35 , 36 , 37 ].…”